堆内超临界水回路辐照装置物理参数模拟研究

Simulation Study on Physical Parameters of In-pile Supercritical Water Loop Irradiation Facility

摘要: 堆内超临界水回路对我国超临界水堆燃料和结构材料的辐照腐蚀实验具有重要意义，辐照装置位于反应堆堆芯栅格，是超临界水回路的核心部件。采用MCNP程序模拟研究辐照装置的关键物理参数，并考虑超临界水热物特性对物理参数的反馈效应。计算得到辐照装置热中子注量率为4.72×10¹³ cm^-2•s^-1，快中子注量率为1.55×10¹⁴ cm^-2•s^-1，辐照产热率为14.7 kW，反应性引入为0.045%。

Abstract: In-pile supercritical water loop is essential for irradiation and corrosion tests of candidate fuel and structural materials of supercritical water reactor. The irradiation facility is the key component of the loop, positioned in the grid of the reactor core. Physical parameters were calculated with MCNP code, considering the thermal feedback. The thermal neutron and fast neutron fluence rate, irradiation heating and reactivity insertion of the irradiation facility are respectively 4.72×10¹³ cm^-2•s^-1, 1.55×10¹⁴ cm^-2•s^-1, 14.7 kW and 0.045%.